<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>后台管理系统</span>
      </div>
      <el-button type='info' @click='logout'>退出</el-button>
    </el-header>
    <!-- 主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse? '64px':'200px'">
        <div class="toggle-button" @click='toggleCollapse'>|||</div>
        <!-- 侧边栏菜单 -->
          <el-menu background-color="#323744" :collapse="isCollapse" text-color="#fff" active-text-color="#409BFF" unique-opened :collapse-transition='false' router :default-active='"/"+activePath'>
            <!-- 一级菜单 -->
            <el-submenu :index='item.id + ""' v-for='item in menulist' :key='item.id'>
              <!-- 一级菜单模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <span>{{ item.authName }}</span>
              </template>
              <!-- 二级菜单 -->
              <el-menu-item :index="'/'+subitem.path" v-for='subitem in item.children' :key='subitem.id' @click='saveNavstate(subitem.path)' ><template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <span>{{ subitem.authName }}</span>
                </template></el-menu-item>
            </el-submenu>
          </el-menu>
      </el-aside>
      <!-- 主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      menulist: [],
      iconsObj: {
        '125': 'iconfont icon-users',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 菜单是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      // 获取所有菜单
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    // 切换菜单的折叠展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活装填
    saveNavstate (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}

</script>

<style lang="less" scoped>
  .home_container {
    height: 100%;
  }

  .el-header {
    background-color: #373C41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    div {
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #323744;
    .el-menu{
      border-right: none;
    }
    .toggle-button{
      background-color: #485164;
      font-size: 10px;
      line-height: 24px;
      color:#fff;
      text-align: center;
      letter-spacing: 0.2em;
      cursor: pointer;
    }
  }

  .el-main {
    background-color: #E9EDF1;
  }
  .iconfont{
    margin-right: 10px
  }

</style>
